.fx {
    display: flex;
}

.fxv {
    flex-direction: column;
}

.fx-vc {
    align-items: center;
}

.fx-hc {
    justify-content: center;
}

.fx-center {
    .fx;
    .fx-vc;
    .fx-hc
}

.fxv-center {
    .fx;
    .fxv;
    .fx-vc;
    .fx-hc
}